What is the most damaging British earthquake?

The Colchester earthquake
of 1884, with a magnitude of 4.6 ML, was the most damaging earthquake
in the UK for several centuries. There was considerable damage to churches,
including the top of a spire falling, falling masonry from roofs, falling
turrets and parapets. The maximum intensity in the epicentral area was
8 EMS. Damage to residential properties included shattering of brick walls,
and chimney falls, often through roofs.